Photographing optical lens assembly and electronic device

Abstract

A photographing optical lens assembly includes five lens elements which are, in order from an object side to an image side: a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. The first lens element has an object-side surface being convex in a paraxial region thereof. The third lens element has an object-side surface being convex in a paraxial region thereof. The fifth lens element has an image-side surface being concave in a paraxial region thereof, and the image-side surface of the fifth lens element has at least one convex shape in an off-axis region thereof.

What is claimed is: 
     
       1. A photographing optical lens assembly comprising five lens elements, the five lens elements being, in order from an object side to an image side:
 a first lens element having an object-side surface being convex in a paraxial region thereof; 
 a second lens element; 
 a third lens element having an object-side surface being convex in a paraxial region thereof; 
 a fourth lens element having an image-side surface being convex in a paraxial region thereof; and 
 a fifth lens element having an image-side surface being concave in a paraxial region thereof, and the image-side surface of the fifth lens element having at least one convex shape in an off-axis region thereof; 
 wherein an Abbe number of the third lens element at a wavelength of helium d-line is Vd3, an Abbe number of the fourth lens element at the wavelength of helium d-line is Vd4, an Abbe number of the fifth lens element at the wavelength of helium d-line is Vd5, an axial distance between the object-side surface of the first lens element and the image-side surface of the fifth lens element is TD, an axial distance between the image-side surface of the fifth lens element and an image surface is BL, and the following conditions are satisfied:
   15< Vd 3+ Vd 4+ Vd 5<75; and 
   3.50< TD/BL< 20. 
 
 
     
     
       2. The photographing optical lens assembly of  claim 1 , wherein the second lens element has an image-side surface being convex in a paraxial region thereof. 
     
     
       3. The photographing optical lens assembly of  claim 1 , wherein the third lens element has an image-side surface being concave in a paraxial region thereof, and the image-side surface of the third lens element has at least one convex shape in an off-axis region thereof. 
     
     
       4. The photographing optical lens assembly of  claim 1 , wherein the fourth lens element has positive refractive power, and the fifth lens element has negative refractive power. 
     
     
       5. The photographing optical lens assembly of  claim 1 , wherein the axial distance between the object-side surface of the first lens element and the image-side surface of the fifth lens element is TD, the axial distance between the image-side surface of the fifth lens element and the image surface is BL, and the following condition is satisfied:
   5.0< TD/BL< 10.0. 
 
     
     
       6. The photographing optical lens assembly of  claim 1 , wherein half of a maximum field of view of the photographing optical lens assembly is HFOV, a focal length of the photographing optical lens assembly at the wavelength of helium d-line is fd, an entrance pupil diameter of the photographing optical lens assembly is EPD, and the following conditions are satisfied:
   0.10<tan(HFOV)<0.70; and 
   0.5< fd/EPD< 1.60. 
 
     
     
       7. The photographing optical lens assembly of  claim 1 , wherein an Abbe number of the first lens element at the wavelength of helium d-line is Vd1, and the following condition is satisfied:
   40< Vd 1<80. 
 
     
     
       8. The photographing optical lens assembly of  claim 1 , wherein the axial distance between the image-side surface of the fifth lens element and the image surface is BL, a sum of axial distances between each of all adjacent lens elements of the photographing optical lens assembly is ΣAT, and the following condition is satisfied:
     BL/ΣAT< 1.50. 
 
     
     
       9. The photographing optical lens assembly of  claim 1 , wherein a focal length of the second lens element at the wavelength of helium d-line is fd2, a focal length of the third lens element at the wavelength of helium d-line is fd3, and the following condition is satisfied:
   | fd 3/ fd 2|<1.0. 
 
     
     
       10. The photographing optical lens assembly of  claim 1 , wherein an entrance pupil diameter of the photographing optical lens assembly is EPD, a maximum image height of the photographing optical lens assembly is ImgH, and the following condition is satisfied:
   1.0< EPD /ImgH. 
 
     
     
       11. The photographing optical lens assembly of  claim 1 , wherein the photographing optical lens assembly is operated within a wavelength range of 1200 nm to 1800 nm. 
     
     
       12. An electronic device, comprising:
 the photographing optical lens assembly of  claim 1 ; 
 a light source configured to generate light within a wavelength range of 1200 nm to 1800 nm; and 
 an image sensor disposed on the image surface of the photographing optical lens assembly.